US10141683B2 - Cable fitting for connecting a high-voltage cable to a high-voltage component or another high-voltage cable - Google Patents

Cable fitting for connecting a high-voltage cable to a high-voltage component or another high-voltage cable Download PDF

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Publication number
US10141683B2
US10141683B2 US15/935,738 US201815935738A US10141683B2 US 10141683 B2 US10141683 B2 US 10141683B2 US 201815935738 A US201815935738 A US 201815935738A US 10141683 B2 US10141683 B2 US 10141683B2
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Prior art keywords
stress relief
relief element
cable fitting
rigid
core insulator
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US15/935,738
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US20180219323A1 (en
Inventor
Jan Czyzewski
Victoria Maurer
Radim Lichy
Torbjörn Sörqvist
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Hitachi Energy Ltd
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ABB Schweiz AG
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Assigned to ABB POWER GRIDS SWITZERLAND AG reassignment ABB POWER GRIDS SWITZERLAND AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABB SCHWEIZ AG
Assigned to HITACHI ENERGY SWITZERLAND AG reassignment HITACHI ENERGY SWITZERLAND AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ABB POWER GRIDS SWITZERLAND AG
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
    • H02G15/072—Cable terminating boxes, frames or other structures with devices for relieving electrical stress of the condenser type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/5205—Sealing means between cable and housing, e.g. grommet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
    • H01R13/59—Threaded ferrule or bolt operating in a direction parallel to the cable or wire
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/007—Devices for relieving mechanical stress
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress
    • H02G15/107—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress of the condenser type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/28—Capacitor type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/0358—Connections to in or out conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress

Definitions

  • the invention relates to a cable fitting for connecting a high-voltage cable to a high-voltage component such as dealt in international patent class H02G15.
  • a cable fitting usually is designed as a cable end termination, for example a high-voltage outdoor cable end termination for application in a voltage range from 52 kV up to 1100 kV.
  • the cable end termination can also be designed as a high-voltage indoor cable end termination, typically for a transformer or for a high-voltage gas-insulated switchgear component.
  • the cable fitting is designed as a high-voltage cable junction used for connecting two high voltage cables together.
  • the high voltage can range from at least 1 kV to more than 1200 kV.
  • Known high-voltage cable end terminations and cable junctions typically comprise a rigid core insulator and an electrically insulating, elastomeric stress relief element coaxially arranged around a longitudinal axis and matching the rigid core insulator through a conical interface and an axially aligned current path.
  • the current path connects a cable conductor encased in an insulation of the cable to a high-voltage current terminal arranged within the rigid core insulator.
  • EP0731994B2 is a representative of such prior art. During operation of a high-voltage component the current path in general continuously conducts a rating current.
  • the rigid core insulator can be formed as a fine graded condenser core with a number of concentric electrically conductive field-grading layers arranged around the current conductor path and embedded in an insulating material, such as described in DE19945148A1. Said field grading layers are commonly produced in that at least two electrically conductive aluminum field grading layers are inserted in between neighboring spacer layers during the winding process of the condenser core.
  • the core insulator can be produced using resin-impregnated paper technology in which crepe insulating paper is used as the spacer sheet material. After completing the winding process, the condenser body is impregnated by an epoxy resin followed by a hardening/curing process.
  • the cable is fixed to a base part of the termination, for example a flange in case of a cable bushing, by a cable clamp and enters the interior of the termination through a stress relief element, e.g. a stress relief cone.
  • the function of the stress relief element is to provide a smooth transition of the very high electric field in the electric insulation of the cable into a much lower electric field in the interior of the termination.
  • the first design approach resides on a so-called inner cone concept where the rigid core insulator has a conical portion that is directed radially inwards with respect to a longitudinal axis defined by the columnar overall shape of the core insulator.
  • the stress relief element has a conical shell portion that is directed radially outwards matching the shape of the conical portion of the core insulator such that an interface is formed.
  • the second design approach resides on a so-called outer cone concept where the core insulator has a conical portion that is directed radially outwards with respect to the longitudinal axis.
  • the stress relief element has a conical shell portion that is directed radially inwards matching the shape of the conical portion of the core insulator such that an interface is formed again.
  • EP0731994B2 is a representative of the second design approach.
  • the core insulator is typically comprising an epoxy-based resin or a similar non-conformable, rigid material, whereas the stress relief element is usually made of conformable, elastic elastomeric materials.
  • the second design approach leads to cable fittings having a smaller diameter of the core insulator compared to cable fittings of the first design approach designed for identical electric conditions because the second design approach allows for arranging the innermost field grading layer to be arranged more proximate to the conductor.
  • the disadvantage of the second approach resides in that the required pressure exerted by the stress relief element on the core insulator is leads to comparatively bulky cable fittings having a comparatively large overall diameter.
  • the object to be solved by the present invention resides in providing a satisfactory solution for forming a cable fitting according to the second design approach that allows achieving the required minimal interface pressure while having a compact overall diameter.
  • the high-voltage cable fitting comprises a rigid core insulator with a cavity for receiving a nominal conductor.
  • the rigid core insulator has a first conical outer surface extending concentrically about a longitudinal axis defined by the columnar overall shape of the high voltage fitting.
  • the cable fitting further has an elastomeric stress relief element having a first conical inner surface designed for mating the first conical outer surface over a predefined length at an interface, as well as a rigid member provided for pressurizing the elastomeric stress relief element at the interface.
  • the term ‘rigid’ is understood as non-deformable when compared to the elastomeric stress relief element which is elastic and deformable.
  • the stress relief element may be a so-called stress relief cone but shall not be understood as being limited to strict cone shapes only.
  • the term ‘conical surface’ is to be understood as substantially conical, i.e. not cylindrical having a steady diameter over its length in the region of the interface.
  • a diameter of the first conical inner surface is smaller than a diameter of the first conical outer surface in an unassembled state of the high-voltage cable fitting.
  • the term ‘at a given annular zone’ is understood as any ring-shaped area extending circumferentially about the longitudinal axis at any place in the direction of the longitudinal axis.
  • the rigid member has at least one pressure enhancing portion extending circumferential about the longitudinal axis for causing an additional axial expansion stress in a sleeve portion of the stress relief element extending along the first conical outer surface of the core insulator in an assembled state of the cable fitting.
  • the rigid member can be a closed, cup-shaped housing/casing or a cage or basket-like construction, for example.
  • the pressure enhancing portion is responsible for causing an additional axial expansion stress in the stress relief element. That additional axial expansion in term is responsible for causing a second radial compression force on the core insulator at the given annular zone on the interface in an assembled state of the high-voltage cable fitting.
  • the pressure enhancing portion and the axial expansion stress in the stress relief element are concerted such that it causes the desired, pre-definable second radial compression force.
  • the pre-definable second radial compression force is such that, added to the first radial compression force, it generates a total pressure, exerted by the stress relief element on the rigid insulator at the interface, larger than 0.1 MPa, preferably more than 0.3 MPa, for withstanding the required electric fields.
  • maintaining the required pressure between the core insulator and the stress relief element allows to design these parts with reasonably large field and, at a defined rated voltage of the device, with reasonably small size in terms of dimension.
  • the stress relief element is cup-shaped and has an opening formed by the first conical inner surface.
  • the stress relief element has a circumferential collar directed radially outwards with respect to the longitudinal axis and a first end face located at the entry of said opening.
  • the rigid member has an inner contour for receiving the stress relief element.
  • the pressure enhancing portion is located at the inner contour such that it engages with the collar such that an additional axial expansion stress in the sleeve portion of the stress relief element extending along the first conical outer surface of the core insulator is caused in an assembled state of the cable fitting.
  • this pressure enhancing portion resides in that it pulls on the collar in the direction of the longitudinal axis such that a radially outer contour of the stress relief element is displaced in the direction of the longitudinal axis relative to the first conical inner surface resulting in additional elongation within the sleeve region of the stress relief element.
  • the additional elongation in the sleeve portion leads to an additional axial stress and consequently to a tendency to radial contraction of the stress relief element with respect to the longitudinal axis.
  • the tendency to radial contraction acting against the first outer conical surface of the rigid core insulator generates the desired second radial compression force.
  • the pressure of the satisfactory high value can be obtained at the interface between the stress relief element and the rigid core insulator with the small outer diameter of the stress relief element. Therefore the diameter at a given annular zone on the shell surface of the stress relief element is larger in an unassembled state of the cable fitting than in an assembled state of the cable fitting.
  • the pressure enhancing portion is shaped and dimensioned and concerted with respect to the thickness of the collar in the direction of the longitudinal axis such that the collar is not damaged but just sufficiently pressurized to be pulled in the axial direction thus generating the additional axial expansion stress which is properly converted into the desired second compression force acting on the interface. Therefore, it is recommended that a minimal clearance in between the rigid counter-face and the pressure enhancing portion measures at least one third of a minimal wall thickness of the sleeve portion of the stress relief element.
  • the dimensional tolerances of the stress relief element vary a lot or if there are large differences between thermal expansion coefficients of the rigid core insulator, the stress relief element and the rigid member, it may be advantageous to shape the inner contour of the rigid member in such a way that there is at least one of a ring-shaped first gap in between a lateral shell surface of the stress relief element and the inner contour of the rigid member and a ring-shaped second gap in between the collar of the stress relief element and the inner contour of the rigid member. That first gap accommodates the changes of dimensions caused by the varying tolerances or by thermal expansion or shrinkage of the components of the cable fitting.
  • the rigid member of the cable fitting has an inner contour that is directed towards the stress relief member and the pressure enhancing portion comprises a plurality of stepped shoulders that are arranged at that inner contour at least in an area facing the first conical outer surface where the second compression force is desired.
  • the plurality of stepped shoulders are inclined with respect to the longitudinal axis about an inclination angle.
  • the stress relief element is cup-shaped and has an opening formed by the first conical inner surface and a first end face located at the entry of said opening.
  • the stress relief element has an outer contour that is directed towards the rigid member and has a plurality of counter-shoulders for interacting with the stepped shoulders of the rigid member such that an additional axial expansion stress in the sleeve portion of the stress relief element is caused in an assembled state of the cable fitting.
  • Such a pressure enhancing portion acting on the counter-shoulders of the stress relief element resides in that it serves for pulling the outer contour of the stress relief element such that it becomes displaced in the direction of the longitudinal axis relative to the first conical inner surface in an assembled state of the cable fitting resulting in additional elongation within the sleeve region of the stress relief element.
  • the additional axial elongation in the sleeve portion leads to an additional axial stress and consequently to a tendency to radial contraction of the stress relief element with respect to the longitudinal axis.
  • the tendency to radial contraction acting against the first outer conical surface of the rigid core insulator generates the desired second radial compression force.
  • the contact surface between the shoulder and the counter-shoulder is designed and sized properly with respect to resiliency value of the stress relief cone chosen in order to ensure that the axial force and thus axial pressure of the rigid member applied to the stress relief element does not lead to local damage at the counter shoulders of the stress relief element.
  • the minimal contact surface is of about 25% of the total surface of the counter-shoulder of the stress relief element.
  • the inclination angle of the stepped shoulders is about 90 degrees.
  • a support ring is arranged in between each one of the plurality of the shoulders and the counter-shoulders.
  • These supports rings are rigid and mechanically stable, for example made of metal.
  • a suitable grease like for example silicone grease may be provided between the end faces of the support rings and their dedicated shoulders to minimize the friction there.
  • the force acting at the engaging surfaces i.e. at the shoulders and counter-shoulders acts at an angle and thus has both axial- and radial force components.
  • the axial force component of the force keeps the elastomeric element in position and generates axial expansion stress in the elastomeric stress relief element.
  • the radial force component of the force produces additional pressure at the interface directly.
  • the outer diameters of the elastomeric stress relief element can be further minimized.
  • such an embodiment also allows for a yet more advanced embodiment of a cable fitting where the inclination angles may vary for each step in order to allow a comparatively large design freedom and sufficient room for tuning and optimization, where needed.
  • the cable fitting may be such that its pressure enhancing portion is a sleeve-shaped pressure body provided between the stress relief member and the rigid member.
  • the pressure body has a second conical inner surface that is matching a second conical outer surface of the stress relief element at least in an area facing the first conical outer surface.
  • a compression system is provided between an axial end face of the pressure body and the rigid member for exerting an axial force on the pressure body in an assembled state of the cable fitting such that an additional axial expansion stress in the sleeve portion of the stress relief element is caused in an assembled state of the cable fitting.
  • the additional axial expansion stress in the sleeve portion leads to an elongation of the stress relief element and consequently to a tendency to radial contraction with respect to the longitudinal axis and thus to the desired second compression force.
  • the opening angle of the second conical inner surface of the pressure body is larger than the opening angle of the first conical outer surface.
  • the pressure at the interface is generated not only by the circumferential elastic expansion of the stress relief element pressed on the rigid core insulator and by the second radial compression force resulting from axial expansion of the stress relief element generated by the pressure body but also by a fourth radial compression force resulting from a radial compression of the stress relief element by the pressure body pushed by the compression system.
  • the advantage of this embodiment is that the fourth radial compression force can be adjusted to the required value by choosing the compression system generating the appropriate axial force.
  • the thermal expansion of the rigid core insulator and the elastomeric stress relief element is absorbed by an axial movement of the pressure body against the force of the compression system.
  • the compression system may comprise a plurality of compression springs, for example helical compression springs that are provided at periodic intervals about the longitudinal axis.
  • a ring-shaped elastic body made of a material that is harder than the stress relief element can be employed.
  • the cable fitting can comprise a rigid flange extending circumferentially about the rigid core insulator and having a second end face directed towards the first end face of the stress relief element.
  • a ring-shaped third gap in between the first end face of the stress relief element and the second end face of the flange as it avoids any superposition issues resulting of a third radial compression force.
  • Particularly compact cable fittings having small diameters at their thickest point of the rigid member are achievable if the rigid member has a bell-shaped cross-section with a tapered portion whose second cone angle is deviating from a first cone angle of the first conical outer surface by less than 30 degrees with respect to the longitudinal axis.
  • Particularly advantageous interface properties are achievable if the first cone angle is in a range between 7 and 20 degrees.
  • the rigid core insulator is formed as a condenser core having at least one electrically conducting field grading layer enclosed in between neighboring spacer layers.
  • the radially innermost field-grading layer is electrically connected to the high-voltage potential of the cable conductor and the radially outermost field-grading layer is electrically connected to the ground potential of a rigid flange, or the like.
  • the set of the field-grading layers forms a capacitive field-grading system.
  • the spacer layers contain multitude of fibers which are impregnated by a hardenable resin, for example epoxy resin, comprising inorganic filler particles.
  • a hardenable resin for example epoxy resin, comprising inorganic filler particles.
  • the casting and hardening of such filled resin can be made in a suitable mold which has an additional advantage that the high smoothness of the first conical outer surface can be obtained thus additionally increasing the quality of the interface.
  • an electrically conductive connector shield is integrated into the stress relief element such that it contacts the first conical outer surface of the core insulator at its thinner end in an assembled state of the cable fitting.
  • an electrically conductive field deflector is integrated into the stress relief element such that it contacts the first conical outer surface of the core insulator in an assembled state of the cable fitting at its thicker end and extends over an outer surface of the stress relief element.
  • the advantages relating to the cable fitting are likewise applicable to a high voltage apparatus comprising a cable fitting such as described above.
  • a high voltage cable is connected to the conductor and the stress relief element is exerting a radial compression force on the high-voltage cable in that it is pressed on high-voltage cable.
  • FIG. 1 a cross section of a first embodiment of the cable fitting along a longitudinal axis
  • FIG. 2 a cross section of a second embodiment of the cable fitting along the longitudinal axis
  • FIG. 3 a cross section of a third embodiment of the cable fitting along the longitudinal axis
  • FIG. 4 a cross section of a fourth embodiment of the cable fitting along the longitudinal axis
  • FIG. 5 a cross section of a fifth embodiment of the cable fitting along the longitudinal axis.
  • FIG. 6 a cross section of a sixth embodiment of the cable fitting along the longitudinal axis.
  • the first embodiment of the cable fitting 10 in an assembled state shown in FIG. 1 has a rigid core insulator 1 that is formed as a condenser core comprising a plurality of aluminum field grading layers 2 enclosed in between neighboring spacer layers made of a composite material comprising a fiber-based spacer, and epoxy resin (not shown in detail).
  • the spacer can be made of organic polymer fibers or glass fibers.
  • the epoxy resin can be filled by inorganic material, for example quartz powder.
  • the rigid core insulator 1 has a cavity 3 for receiving a nominal conductor 32 .
  • the core insulator 1 further has a first conical outer surface 4 extending concentrically about a longitudinal axis 5 defined by the columnar overall shape of the cable fitting.
  • An elastomeric stress relief element 6 has a first conical inner surface 7 is designed for mating the first conical outer surface 4 over a predefined length 8 at an interface 9 .
  • the rigid casing 11 has an inner contour 16 for receiving and directed towards the stress relief element 6 .
  • a pressure enhancing portion 17 is located at the inner contour 16 such that it engages with the collar 14 such that an additional axial expansion stress 23 indicated by double headed arrows is caused in a sleeve portion 19 of the stress relief element 6 extending along the first conical outer surface 4 .
  • the pressure enhancing portion 17 has a horn-shaped cross-section extending circumferentially about the longitudinal axis 5 .
  • the cable fitting 10 has further a rigid flange 21 extending circumferentially extending about the rigid core insulator 1 .
  • the flange 21 has a second end face 22 that is directed towards the first end face 15 of the stress relief element.
  • the pressure enhancing portion 17 is pulling the collar 14 towards the second end face 22 and thus creating additional axial expansion stress 23 indicated by second double headed arrows in the sleeve portion 19 of the stress relief element 6 .
  • the additional axial expansion stress 23 As a result, a first radial compression force 24 resulting from the press-fitting process is increased by a second radial compression force 25 resulting from the additional axial expansion stress 23 caused by the pressure enhancing portion 17 such that a very satisfactory interface quality with no substantial voids is achieved and a total radial pressure of around 0.3 MPa is generated at the interface 9 .
  • the first radial compression force 24 and the second radial compression force 25 are shown outside the given annular zone 12 only for clarity reasons of FIG. 1 but are present in said given annular zone 12 .
  • the given annular zone 12 is a mere representative of any spot at the interface 9 along the predefined length 8 .
  • a first radial gap 26 is present between the sleeve portion 19 and the inner contour 16 of the rigid casing. Radially outside of the collar 14 , an annular second gap 41 is present.
  • the rigid casing 11 and the rigid flange 21 are made of metal, whereas the elastomeric stress relief element 6 is made of elastomeric material, such as rubber, for example silicone rubber or EPDM rubber.
  • the rigid flange 21 and the rigid casing 11 are fastened together by a number of bolts 28 provided at a circumferential portion of the cable fitting 10 .
  • the second embodiment of a cable fitting 20 shown in FIG. 2 differs to the first embodiment 10 only very little. Hence, only the differences of the second embodiment 20 with respect to the first embodiment 10 are addressed and explained hereinafter.
  • the second embodiment of the cable fitting 20 there is a ring-shaped third gap 37 in between the first end face 15 of the stress relief element 6 and the second end face 22 of the flange 21 .
  • no third radial compression force 27 is present at the opening 13 along the first conical outer surface 4 of the core insulator 1 .
  • the first radial compression force 24 and the second radial compression force 25 are present in the sleeve portion 19 again.
  • the third embodiment of a cable fitting 30 shown in FIG. 3 differs to the first embodiment 10 in that the pressure enhancing portion 17 comprises a plurality of stepped shoulders 38 arranged at the inner contour 16 at least in an area facing the first conical outer surface 4 .
  • Each of the relevant stepped shoulders 38 are inclined with respect to the longitudinal axis 5 at an inclination angle 39 .
  • a suitable grease for example silicone grease, is provided in between the stepped shoulders 38 and the counter-shoulders 42 .
  • the stress relief element 6 has an outer contour 35 that is directed towards the rigid housing 11 and has a matching number of counter-shoulders 42 for interacting with the stepped shoulders 38 of the rigid housing 11 such that an additional axial expansion stress 23 is caused in the sleeve portion of the stress relief element in an assembled state of the cable fitting 30 .
  • the stepped shoulder—counter-shoulder combination provides for a distributed insertion of the additional axial expansion stress 23 in the stress relief element 6 in the direction of the longitudinal axis 5 .
  • the axial extension of the sleeve portion 19 owing to the additional axial expansion stress 23 leads in turn to the desired second radial compression force 25 in addition to the first radial compression force 24 resulting from the press-fitting of the stress relief element 6 onto the core insulator 1 .
  • a ring-shaped third gap 37 is present in between the first end face 15 of the stress relief element 6 and the second end face 22 of the flange 21 . Owing to the presence of the third gap 37 , no third radial compression force 27 is present at the opening 13 along the first conical outer surface 4 of the core insulator 1 , again.
  • the inclination angle 39 of the stepped shoulders 38 is about 90 degrees with respect to the longitudinal axis 5 .
  • the rigid housing 11 has a bell-shaped cross-section with a tapered portion 44 whose second cone angle 46 is deviating from a first cone angle 45 of the first conical outer surface 4 less than 30 degrees with respect to the longitudinal axis 5 .
  • the fourth embodiment of a cable fitting 40 shown in FIG. 4 differs to the third embodiment 30 only to some extent. Hence, only the differences of the fourth embodiment 40 with respect to the third embodiment 30 are addressed and explained hereinafter.
  • the inclination angle 39 of the stepped shoulders 38 is in a range of 30 to 80 degrees with respect to the longitudinal axis 5 . Since the stepped shoulders 38 are inclined with respect to the longitudinal axis, they not only lead to the desired additional axial expansion stress 23 and thus to the desired second radial compression force 25 but also to a fourth radial compression force 43 owing to the axial and the radial force component of the stress brought in via the shoulders 38 . Therefore, the total of all radial forces acting at the interface 9 are the first radial compression force 24 , the second radial compression force 25 plus the fourth radial compression force 43 .
  • the rigid housing 11 has a bell-shaped cross-section with a tapered portion 44 whose second cone angle 46 is deviating from a first cone angle 45 of the first conical outer surface 4 less than 30 degrees with respect to the longitudinal axis 5 .
  • the fifth embodiment of a cable fitting 50 shown in FIG. 5 differs to the third embodiment 30 only to some extent. Hence, only the differences of the fifth embodiment 50 with respect to the third embodiment 30 are addressed and explained hereinafter.
  • the inner contour 16 of the housing has been adjusted such that the contact surfaces of the stepped shoulders 38 in the rigid housing 11 is increased.
  • a metallic support ring 47 that is greased on its side matching the shoulders 38 of the rigid housing 11 is arranged in between each one of the plurality of shoulders 38 and counter-shoulders 42 .
  • the rigid housing 11 has a bell-shaped cross-section with a tapered portion 44 whose second cone angle 46 is deviating from a first cone angle 45 of the first conical outer surface 4 less than 30 degrees with respect to the longitudinal axis 5 .
  • the sixth embodiment of a cable fitting 60 shown in FIG. 6 differs to the second embodiment 20 a fair bit.
  • the housing 11 has no pressure enhancing portion 17 that is integrated directly in its inner contour 16 .
  • the pressure enhancing portion 17 belongs to a sleeve-shaped pressure body 48 provided between the stress relief member 6 and the actual housing 11 .
  • the pressure body 48 has a second conical inner surface 49 that is matching a second conical outer surface 51 that is part of the outer contour 35 of the stress relief element 6 at least in an area facing the first conical outer surface 4 .
  • a compression system 52 is provided between an axial end face 53 of the pressure body 49 and the housing 11 for exerting an axial force on the pressure body 49 and thus causing the additional axial expansion stress 23 in the sleeve portion 19 of the stress relief element 6 in an assembled state of the cable fitting 60 .
  • the compression system 52 comprises a plurality of compression springs 54 that are provided at periodic intervals about the longitudinal axis 5 . Between the stress relief element 6 and the compression springs 54 a compression ring 55 is provided.
  • the size of the first radial gap 26 between the inner contour 16 of the rigid housing 11 and the stress relief element 6 is chosen that large that there remains a gap between the pressure body 48 and the inner contour 16 in order to allow free movement of the pressure body 48 in the direction of the longitudinal axis 5 .

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  • Cable Accessories (AREA)
US15/935,738 2015-09-25 2018-03-26 Cable fitting for connecting a high-voltage cable to a high-voltage component or another high-voltage cable Active US10141683B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP15186898.1 2015-09-25
EP15186898 2015-09-25
EP15186898.1A EP3148010A1 (en) 2015-09-25 2015-09-25 A cable fitting for connecting a high-voltage cable to a high-voltage component or another high-voltage cable
PCT/EP2016/072488 WO2017050859A1 (en) 2015-09-25 2016-09-22 A cable fitting for connecting a high-voltage cable to a high-voltage component or another high-voltage cable

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PCT/EP2016/072488 Continuation WO2017050859A1 (en) 2015-09-25 2016-09-22 A cable fitting for connecting a high-voltage cable to a high-voltage component or another high-voltage cable

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US20180219323A1 US20180219323A1 (en) 2018-08-02
US10141683B2 true US10141683B2 (en) 2018-11-27

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US (1) US10141683B2 (zh)
EP (2) EP3148010A1 (zh)
CN (1) CN108028493B (zh)
CA (1) CA2996076C (zh)
DK (1) DK3353861T3 (zh)
RU (1) RU2676531C1 (zh)
WO (1) WO2017050859A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220172865A1 (en) * 2019-03-29 2022-06-02 Tai Han Electric Wire Co., Ltd. Dry-type plug-in bushing, manufacturing method of the same, and high-voltage installation comprising same

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK3148027T3 (da) * 2015-09-25 2020-03-23 Abb Schweiz Ag Kabelforskruning til forbindelse af et højspændingskabel til en højspændingskomponent
EP3594981A1 (en) * 2018-07-12 2020-01-15 ABB Schweiz AG An earthing switch
DE102018211741A1 (de) 2018-07-13 2020-01-16 Siemens Aktiengesellschaft Elektrische Steckeinrichtung und Anordnung mit einer elektrischen Steckeinrichtung
EP3731361A1 (en) 2019-04-26 2020-10-28 Brugg Kabel AG Cable fitting
WO2021110258A1 (de) * 2019-12-04 2021-06-10 Siemens Aktiengesellschaft Elektrisches gerät mit einer steckbaren hochspannungs-durchführung und einem geräteanschlussteil zur aufnahme der hochspannungsdurchführung
EP4016756A1 (en) * 2020-12-18 2022-06-22 NKT HV Cables AB Cable connector
CN115828710B (zh) * 2023-01-28 2023-09-08 湖南经研电力设计有限公司 电缆支架金具的不均匀厚度设计方法及系统

Citations (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800526A (en) * 1954-09-30 1957-07-23 Walter H Moorhead Self-locking flexible grommet
US3401370A (en) * 1966-08-10 1968-09-10 Mc Graw Edison Co Separable connector for underground system
US3711818A (en) * 1970-11-09 1973-01-16 Joslyn Mfg & Supply Co Electrical disconnect
US3744008A (en) * 1971-11-23 1973-07-03 Thomas & Betts Corp Strain relief assembly
US3805218A (en) * 1973-04-04 1974-04-16 Atomic Energy Commission Battery cable assembly
US3861777A (en) * 1973-09-20 1975-01-21 Permali Inc Separable electrical connector
DE2609079B1 (de) 1976-03-05 1977-09-08 Pfisterer Elektrotech Karl Kabeleinfuehrung
US4336977A (en) * 1978-09-05 1982-06-29 Bunker Ramo Corporation Crimped connector assembly for fiber optic cables
DE3243690A1 (de) 1982-11-25 1984-05-30 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart Kontaktvorrichtung
US4627673A (en) * 1985-12-20 1986-12-09 Wang Laboratories, Inc. Grounding and strain relief clamp for flat cables
US4931023A (en) * 1989-09-19 1990-06-05 Browne Alan R Cord strain relief device and associated lamp
US4946393A (en) * 1989-08-04 1990-08-07 Amerace Corporation Separable connector access port and fittings
US5023402A (en) * 1989-12-13 1991-06-11 King Technology Of Missouri, Inc. Waterproof wire connector
US5030135A (en) * 1990-11-29 1991-07-09 Compaq Computer Corporation Cable strain relief device
GB2254493A (en) 1990-12-27 1992-10-07 Rover Group A connector for a high tension lead.
US5616049A (en) * 1994-03-24 1997-04-01 The Whitaker Corporation Connector assembly for metal-jacketed lambda probe conductor
US5626491A (en) * 1995-08-18 1997-05-06 The Whitaker Corporation Electrical connector strain relief for cable
US5908332A (en) * 1994-09-30 1999-06-01 Alcatel Cable Cable termination
DE19945148A1 (de) 1999-09-21 2001-03-22 Detlef Jegust Endverschuß mit Stützfunktion
US6439929B1 (en) * 2000-03-30 2002-08-27 Westinghouse Air Brake Technologies Braided shield terminating potting backshell
US7422469B1 (en) * 2007-12-07 2008-09-09 Ching-Wen Chang Audio plug and method of making thereof
US7955132B2 (en) * 2009-01-23 2011-06-07 Molex Incorporated HDMI cable connector
EP2431982A1 (de) 2010-09-21 2012-03-21 ABB Technology AG Steckbare Durchführung und Hochspannungsanlage mit einer solchen Durchführung
US8556649B2 (en) * 2009-01-23 2013-10-15 Weidmueller Interface Gmbh & Co. Kg Fixing device for fixing a cable at a housing feed-through
US20140073176A1 (en) * 2012-08-30 2014-03-13 Christopher Plant Underwater Connecting Apparatuses and Assemblies
US20150207265A1 (en) * 2012-08-30 2015-07-23 Siemens Aktiengesellschaft Underwater Connecting Apparatus and Assemblies
US20160126641A1 (en) * 2013-06-04 2016-05-05 Siemens Akitiengesellschaft Underwater connecting apparatus and assemblies

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926950A1 (de) * 1999-06-14 2000-12-21 Abb Research Ltd Kabelendgarnitur
DE102005008680B3 (de) * 2005-02-25 2006-10-26 Nkt Cables Gmbh Steckvorrichtung für Geräte oder Kabel an eine elektrische Anlage

Patent Citations (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800526A (en) * 1954-09-30 1957-07-23 Walter H Moorhead Self-locking flexible grommet
US3401370A (en) * 1966-08-10 1968-09-10 Mc Graw Edison Co Separable connector for underground system
US3711818A (en) * 1970-11-09 1973-01-16 Joslyn Mfg & Supply Co Electrical disconnect
US3744008A (en) * 1971-11-23 1973-07-03 Thomas & Betts Corp Strain relief assembly
US3805218A (en) * 1973-04-04 1974-04-16 Atomic Energy Commission Battery cable assembly
US3861777A (en) * 1973-09-20 1975-01-21 Permali Inc Separable electrical connector
DE2609079B1 (de) 1976-03-05 1977-09-08 Pfisterer Elektrotech Karl Kabeleinfuehrung
US4336977A (en) * 1978-09-05 1982-06-29 Bunker Ramo Corporation Crimped connector assembly for fiber optic cables
DE3243690A1 (de) 1982-11-25 1984-05-30 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart Kontaktvorrichtung
US4627673A (en) * 1985-12-20 1986-12-09 Wang Laboratories, Inc. Grounding and strain relief clamp for flat cables
US4946393A (en) * 1989-08-04 1990-08-07 Amerace Corporation Separable connector access port and fittings
US4931023A (en) * 1989-09-19 1990-06-05 Browne Alan R Cord strain relief device and associated lamp
US5023402A (en) * 1989-12-13 1991-06-11 King Technology Of Missouri, Inc. Waterproof wire connector
US5030135A (en) * 1990-11-29 1991-07-09 Compaq Computer Corporation Cable strain relief device
GB2254493A (en) 1990-12-27 1992-10-07 Rover Group A connector for a high tension lead.
US5616049A (en) * 1994-03-24 1997-04-01 The Whitaker Corporation Connector assembly for metal-jacketed lambda probe conductor
US5908332A (en) * 1994-09-30 1999-06-01 Alcatel Cable Cable termination
EP0731994B1 (en) 1994-09-30 1999-10-20 Alcatel Cable Cable termination
US6050855A (en) * 1994-09-30 2000-04-18 Alcatel Cable termination
US5626491A (en) * 1995-08-18 1997-05-06 The Whitaker Corporation Electrical connector strain relief for cable
DE19945148A1 (de) 1999-09-21 2001-03-22 Detlef Jegust Endverschuß mit Stützfunktion
US6439929B1 (en) * 2000-03-30 2002-08-27 Westinghouse Air Brake Technologies Braided shield terminating potting backshell
US7422469B1 (en) * 2007-12-07 2008-09-09 Ching-Wen Chang Audio plug and method of making thereof
US7955132B2 (en) * 2009-01-23 2011-06-07 Molex Incorporated HDMI cable connector
US8556649B2 (en) * 2009-01-23 2013-10-15 Weidmueller Interface Gmbh & Co. Kg Fixing device for fixing a cable at a housing feed-through
EP2431982A1 (de) 2010-09-21 2012-03-21 ABB Technology AG Steckbare Durchführung und Hochspannungsanlage mit einer solchen Durchführung
US20120071014A1 (en) 2010-09-21 2012-03-22 Abb Technology Ag Plug-in bushing and high-voltage installation having a bushing such as this
US20140073176A1 (en) * 2012-08-30 2014-03-13 Christopher Plant Underwater Connecting Apparatuses and Assemblies
US20150207265A1 (en) * 2012-08-30 2015-07-23 Siemens Aktiengesellschaft Underwater Connecting Apparatus and Assemblies
US20160126641A1 (en) * 2013-06-04 2016-05-05 Siemens Akitiengesellschaft Underwater connecting apparatus and assemblies

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
European Patent Office, Extended Search Report issued in corresponding Application No. 15186898.1, dated Mar. 7, 2016, 7 pp.
European Patent Office, International Preliminary Report on Patentability issued in corresponding Application No. PCT/EP2016/072488, dated Nov. 30, 2017, 18 pp.
European Patent Office, International Search Report & Written Opinion issued in corresponding Application No. PCT/EP2016/072488, dated Dec. 15, 2016, 13 pp.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220172865A1 (en) * 2019-03-29 2022-06-02 Tai Han Electric Wire Co., Ltd. Dry-type plug-in bushing, manufacturing method of the same, and high-voltage installation comprising same
US12068089B2 (en) * 2019-03-29 2024-08-20 Tai Han Electric Wire Co., Ltd. Dry-type plug-in bushing, manufacturing method of the same, and high-voltage installation comprising same

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Publication number Publication date
DK3353861T3 (da) 2020-04-06
CA2996076A1 (en) 2017-03-30
CA2996076C (en) 2019-04-02
CN108028493A (zh) 2018-05-11
RU2676531C1 (ru) 2019-01-09
CN108028493B (zh) 2020-04-03
BR112018004077A8 (pt) 2022-12-20
US20180219323A1 (en) 2018-08-02
EP3353861A1 (en) 2018-08-01
BR112018004077A2 (zh) 2018-10-02
EP3148010A1 (en) 2017-03-29
EP3353861B1 (en) 2020-01-08
WO2017050859A1 (en) 2017-03-30

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